“I mean, of all the wildly hypocritical things anyone has said about anything during this ordeal, the idea that Obama is classless and shouldn’t say bad things about another president, that might take the cake!” Kimmel said.

“The tonnage of terrible things Trump has said about Obama, I would put them all on screen, but no one in the world has a big-enough screen to see all of them.”

“The screen over the field where the Dallas Cowboys play isn’t big enough for all of them. So he had to be kidding. Mitch, you dirty little snapping turtle, you got us again!” he said during his show.

“It has been an absolute chaotic disaster when that mindset — of ‘what’s in it for me’ and ‘to heck with everybody else’ — when that mindset is operationalized in our government.”

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Obama said that during the 2020 election, 'What we’re fighting against is these long-term trends in which being selfish, being tribal, being divided, and seeing others as an enemy — that has become a stronger impulse in American life'Credit: Getty Images - Getty

Former presidents don’t typically speak out publicly against their successors after leaving office.

McConnell, a Republican from Kentucky, said he wished Obama was more like fellow president George W. Bush, who left the White House in 2008.

"I think the tradition that the Bush's set up — of not critiquing the president who comes after you — is a good tradition."

McConnell also touched upon Obama's time as president and said that, upon his exit, he "did not leave to this administration any kind of game plan for something like [the coronavirus pandemic]."

In 2018, the Trump administration dismantled a National Security Council (NSC) directorate at the White House charged with preparing for when, not if, another pandemic would hit the nation.

In March, Trump was asked whether disbanding the global health unit slowed the US response to the coronavirus outbreak, which as of Wednesday killed more than 84,000 people in the US.

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He called it a “nasty” question because his administration had acted quickly and saved lives.

“I don’t know anything about it,” Trump said, and said the pandemic “is something that you can never really think is going to happen.”